I don't think much of Tabs Mix Plus at all.

These two extensions will do what you asked, they are marked good for 4.* so would work on 5.0 and Mozilla was supposed to automatically upgrade maxVer of extensions from 4.* to 5.*

• New Tab Homepage :: Add-ons for Firefox
  https://addons.mozilla.org/firefox/addon/new-tab-homepage/
• NewTabURL :: Add-ons for Firefox
  https://addons.mozilla.org/firefox/addon/newtaburl/

I have three pages on my own on tabs

• Tabbed Browsing in Firefox
  http://dmcritchie.mvps.org/firefox/tabs.htm
• Tabs configuration, extracted from About:config entries - MozillaZine Knowledge Base
  http://dmcritchie.mvps.org/firefox/tabs_config.htm
• 001 Tab Capacity and other Tests
  http://dmcritchie.mvps.org/firefox/tab_capacity/001_with_underscore.htm

I also like to change the styling on tabs and other chrome aspects of Firefox

• Styles & Extensions that I use, see picture (Red borders -- active tab, Blue borders -- tab has been read, Green borders -- tab has not been read, Magenta borders -- tab is being downloaded)

Thanks muchly but unfortunately these add-ons won't install due to being 'incompatible' with FF5.

You don't have to wait for extension writers or in the case between 4.0 and 5.0 for Mozilla to up the maxVersion. There is the "Add-on Compatibility Reporter " extension or you can modify your about:config

• http://kb.mozillazine.org/Extensions.checkCompatibility

You can middle-click the Home button to have a new tab open with your homepage displayed.

I agree about TabMix Plus, it's too much extension for only wanting or needing that one feature.

https://addons.mozilla.org/en-US/firefox/addon/newtaburl/

It works like a charm.

Great, I install FF5, and non of the completely simple add-ons work.

I don't understand why there isn't some programming implementation allowing things to work that shouldn't have to change, since FF5 still looks just like FF4.